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1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6 
7  1.    INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12 
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18 
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28 
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33 
34 2.    COPYRIGHT LICENSE
35 
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39 
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42 
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48 
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51 
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54 
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60 
61 3.    NO PATENT LICENSE
62 
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67 
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70 
71 4.    DISCLAIMER
72 
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83 
84 5.    CONTACT INFORMATION
85 
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90 
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94 
95 /**************************** AAC encoder library ******************************
96 
97    Author(s):   M.Werner
98 
99    Description: Short block grouping
100 
101 *******************************************************************************/
102 
103 #include "psy_const.h"
104 #include "interface.h"
105 
106 /*
107  * this routine does not work in-place
108  */
109 
110 /*
111  * Don't use fAddSaturate2() because it looses one bit accuracy which is
112  * usefull for quality.
113  */
nrgAddSaturate(const FIXP_DBL a,const FIXP_DBL b)114 static inline FIXP_DBL nrgAddSaturate(const FIXP_DBL a, const FIXP_DBL b) {
115   return ((a >= (FIXP_DBL)MAXVAL_DBL - b) ? (FIXP_DBL)MAXVAL_DBL : (a + b));
116 }
117 
FDKaacEnc_groupShortData(FIXP_DBL * mdctSpectrum,SFB_THRESHOLD * sfbThreshold,SFB_ENERGY * sfbEnergy,SFB_ENERGY * sfbEnergyMS,SFB_ENERGY * sfbSpreadEnergy,const INT sfbCnt,const INT sfbActive,const INT * sfbOffset,const FIXP_DBL * sfbMinSnrLdData,INT * groupedSfbOffset,INT * maxSfbPerGroup,FIXP_DBL * groupedSfbMinSnrLdData,const INT noOfGroups,const INT * groupLen,const INT granuleLength)118 void FDKaacEnc_groupShortData(FIXP_DBL *mdctSpectrum,      /* in-out      */
119                               SFB_THRESHOLD *sfbThreshold, /* in-out */
120                               SFB_ENERGY *sfbEnergy,       /* in-out       */
121                               SFB_ENERGY *sfbEnergyMS,     /* in-out     */
122                               SFB_ENERGY *sfbSpreadEnergy, const INT sfbCnt,
123                               const INT sfbActive, const INT *sfbOffset,
124                               const FIXP_DBL *sfbMinSnrLdData,
125                               INT *groupedSfbOffset, /* out */
126                               INT *maxSfbPerGroup,   /* out */
127                               FIXP_DBL *groupedSfbMinSnrLdData,
128                               const INT noOfGroups, const INT *groupLen,
129                               const INT granuleLength) {
130   INT i, j;
131   INT line;   /* counts through lines              */
132   INT sfb;    /* counts through scalefactor bands  */
133   INT grp;    /* counts through groups             */
134   INT wnd;    /* counts through windows in a group */
135   INT offset; /* needed in sfbOffset grouping      */
136   INT highestSfb;
137   INT granuleLength_short = granuleLength / TRANS_FAC;
138 
139   C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024))
140 
141   /* for short blocks: regroup spectrum and */
142   /* group energies and thresholds according to grouping */
143 
144   /* calculate maxSfbPerGroup */
145   highestSfb = 0;
146   for (wnd = 0; wnd < TRANS_FAC; wnd++) {
147     for (sfb = sfbActive - 1; sfb >= highestSfb; sfb--) {
148       for (line = sfbOffset[sfb + 1] - 1; line >= sfbOffset[sfb]; line--) {
149         if (mdctSpectrum[wnd * granuleLength_short + line] !=
150             FL2FXCONST_SPC(0.0))
151           break; /* this band is not completely zero */
152       }
153       if (line >= sfbOffset[sfb]) break; /* this band was not completely zero */
154     }
155     highestSfb = fixMax(highestSfb, sfb);
156   }
157   highestSfb = highestSfb > 0 ? highestSfb : 0;
158   *maxSfbPerGroup = highestSfb + 1;
159 
160   /* calculate groupedSfbOffset */
161   i = 0;
162   offset = 0;
163   for (grp = 0; grp < noOfGroups; grp++) {
164     for (sfb = 0; sfb < sfbActive + 1; sfb++) {
165       groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp];
166     }
167     i += sfbCnt - sfb;
168     offset += groupLen[grp] * granuleLength_short;
169   }
170   groupedSfbOffset[i++] = granuleLength;
171 
172   /* calculate groupedSfbMinSnr */
173   i = 0;
174   for (grp = 0; grp < noOfGroups; grp++) {
175     for (sfb = 0; sfb < sfbActive; sfb++) {
176       groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb];
177     }
178     i += sfbCnt - sfb;
179   }
180 
181   /* sum up sfbThresholds */
182   wnd = 0;
183   i = 0;
184   for (grp = 0; grp < noOfGroups; grp++) {
185     for (sfb = 0; sfb < sfbActive; sfb++) {
186       FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb];
187       for (j = 1; j < groupLen[grp]; j++) {
188         thresh = nrgAddSaturate(thresh, sfbThreshold->Short[wnd + j][sfb]);
189       }
190       sfbThreshold->Long[i++] = thresh;
191     }
192     i += sfbCnt - sfb;
193     wnd += groupLen[grp];
194   }
195 
196   /* sum up sfbEnergies left/right */
197   wnd = 0;
198   i = 0;
199   for (grp = 0; grp < noOfGroups; grp++) {
200     for (sfb = 0; sfb < sfbActive; sfb++) {
201       FIXP_DBL energy = sfbEnergy->Short[wnd][sfb];
202       for (j = 1; j < groupLen[grp]; j++) {
203         energy = nrgAddSaturate(energy, sfbEnergy->Short[wnd + j][sfb]);
204       }
205       sfbEnergy->Long[i++] = energy;
206     }
207     i += sfbCnt - sfb;
208     wnd += groupLen[grp];
209   }
210 
211   /* sum up sfbEnergies mid/side */
212   wnd = 0;
213   i = 0;
214   for (grp = 0; grp < noOfGroups; grp++) {
215     for (sfb = 0; sfb < sfbActive; sfb++) {
216       FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb];
217       for (j = 1; j < groupLen[grp]; j++) {
218         energy = nrgAddSaturate(energy, sfbEnergyMS->Short[wnd + j][sfb]);
219       }
220       sfbEnergyMS->Long[i++] = energy;
221     }
222     i += sfbCnt - sfb;
223     wnd += groupLen[grp];
224   }
225 
226   /* sum up sfbSpreadEnergies */
227   wnd = 0;
228   i = 0;
229   for (grp = 0; grp < noOfGroups; grp++) {
230     for (sfb = 0; sfb < sfbActive; sfb++) {
231       FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb];
232       for (j = 1; j < groupLen[grp]; j++) {
233         energy = nrgAddSaturate(energy, sfbSpreadEnergy->Short[wnd + j][sfb]);
234       }
235       sfbSpreadEnergy->Long[i++] = energy;
236     }
237     i += sfbCnt - sfb;
238     wnd += groupLen[grp];
239   }
240 
241   /* re-group spectrum */
242   wnd = 0;
243   i = 0;
244   for (grp = 0; grp < noOfGroups; grp++) {
245     for (sfb = 0; sfb < sfbActive; sfb++) {
246       int width = sfbOffset[sfb + 1] - sfbOffset[sfb];
247       FIXP_DBL *pMdctSpectrum =
248           &mdctSpectrum[sfbOffset[sfb]] + wnd * granuleLength_short;
249       for (j = 0; j < groupLen[grp]; j++) {
250         FIXP_DBL *pTmp = pMdctSpectrum;
251         for (line = width; line > 0; line--) {
252           tmpSpectrum[i++] = *pTmp++;
253         }
254         pMdctSpectrum += granuleLength_short;
255       }
256     }
257     i += (groupLen[grp] * (sfbOffset[sfbCnt] - sfbOffset[sfb]));
258     wnd += groupLen[grp];
259   }
260 
261   FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength * sizeof(FIXP_DBL));
262 
263   C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024))
264 }
265